Dynamic Support Carbon Insole adsorbs human odor while warm and comfortable S3? antimicrobial wool insulation with 6mm perforated air-trap flex foam keeps feet warm. The upper is made of high-altitude durable yak leather, with a durable Vibram? outsole and supportive polyurethane midsole. 100% waterproof breathable membrane. Climb right heel design. Color: Dark Brown. Imported. Features: Removable activated carbon insole with S3? antimicrobial technology and toe warmer compatible Warm & comfortable S3? antimicrobial wool insulation with 6mm perforated air trap flex foam High altitude durable yak leather ? 3 times stronger than comparable weight cowhide Durable Vibram? outsole with supportive polyurethane midsole 100% waterproof breathable membrane construction Genuine deer leather comfort flex collar & tongue Reinforced rubber rand & toe protection Climb right heel design Brush blocker heel support guard Comes with dynamic support carbon bonus insole with S3? Manufacturer style #: FDMPIN.